Human physiology worksheet with answers

Which hormone raises blood calcium levels?

1. ACalcitonin
2. BParathyroid hormone
3. CThyroxine
4. DInsulin

Which hormone lowers blood glucose?

1. AInsulin
2. BCortisol
3. CAdrenaline
4. DGlucagon

Which gland is often called the "master gland" because it controls many other endocrine glands?

1. AThyroid gland
2. BPineal gland
3. CPituitary gland
4. DAdrenal gland

The Frank–Starling mechanism describes that:

1. AContractility falls when temperature rises
2. BHeart rate rises when arterial blood pressure falls suddenly
3. CStroke volume rises when ventricular filling increases
4. DThe atria contract after the ventricles

During contraction of a skeletal muscle sarcomere, which band stays the same length?

1. AH zone
2. BThe whole sarcomere
3. CI band
4. DA band

Which protein forms the mesh that stabilises a blood clot?

1. ACollagen
2. BThrombin
3. CAlbumin
4. DFibrin

Why can a patient with carbon monoxide poisoning have a normal PaO₂ but severe tissue hypoxia?

1. ACO occupies haemoglobin binding sites, so oxygen content falls
2. BCO lowers the barometric pressure in the alveoli
3. CCO blocks diffusion across the alveolar wall
4. DCO stops oxygen from dissolving in plasma

According to the length–tension relationship, why does a skeletal muscle fibre produce less force when overstretched?

1. AThe neuromuscular junction stops working
2. BThe muscle runs out of ATP when stretched
3. CActin and myosin overlap less, so fewer cross-bridges form
4. DCalcium is no longer released from the sarcoplasmic reticulum when stretched